| 重庆二叠—三叠系界线地层的干裂缝和侵蚀面及其意义 |
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| 引用本文： | 姜红霞,吴亚生,袁生虎.重庆二叠—三叠系界线地层的干裂缝和侵蚀面及其意义[J].高校地质学报,2007,13(1):53-59. |
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| 作者姓名： | 姜红霞 吴亚生 袁生虎 |
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| 作者单位： | 1.中国科学院 地质与地球物理研究所，北京 100029； 2. 玉门油田分公司勘探事业部，甘肃735200 |
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| 基金项目： | 国家自然科学基金项目(项目号40472015)，现代古生物学和地层学国家重点实验室开放课题基金(项目号053102)成果。 |
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| 摘 要： | 剖面研究揭示，重庆老龙洞地区二叠系—三叠系界线上下地层中发育厚约3 m的微生物岩。该微生物岩的上部发育树枝状构造，下部具斑点状构造，因此被明显的分为上下两部分；其上部岩层顶面发育有侵蚀面，下部岩层顶面发育干裂缝。根据微生物岩上下岩层的沉积相分析和相关资料的对比研究表明，研究区在二叠纪—三叠纪之交，经历了暴露和侵蚀过程。研究结果为深入探讨这一重要地质时期的海平面变化提供了新的资料。
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| 关 键 词： | 干裂缝 微生物岩 二叠纪-三叠纪界线地层 海平面下降 |
| 文章编号： | 1006-7493（2007）01-0053-07 |
| 收稿时间： | 2007-01-04 |
| 修稿时间： | 2007-02-28 |
Dessication Cracks and Erosional Surface in the Permian-Triassic Boundary Section in Chongqing |
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| JIANG Hong-xia,WU Ya-sheng,YUAN Sheng-hu.Dessication Cracks and Erosional Surface in the Permian-Triassic Boundary Section in Chongqing[J].Geological Journal of China Universities,2007,13(1):53-59. |
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| Authors: | JIANG Hong-xia WU Ya-sheng YUAN Sheng-hu |
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| Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. Exploration Business Department of Yumen Oilfield Branch Company, Gansu 735200, China |
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| Abstract: | This paper refers to a 3 m thick microbialite in the Permian-Triassic boundary section in Laolongdong, Chongqing. The microbialite comprises a dendroid upper part and a specked lower part. An erosional surface is found at the top of the upper part of the microbialite. Some dessication cracks occurred on the top surface of the lower part of the microbialite. Study on depositional environment of the microbialite indicates that the microbialite was emerged to the earth surface and eroded during the Permian-Triassic interval, which provides new data for the sea level changes across the Permian-Triassic boundary, an important geological epoch. |
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| Keywords: | dessication cracks microbialite Permian-Triassic boundary section sea level fall |
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